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Old 02-10-2007, 03:18 PM
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Can someone explain something to me?

I have read about injector o ring causing smoke,oil usage ect.I put two new injectors in a 99 today and was looking at the design and I am a little confused.But it doesnt take much for that to happen lol.The injector goes down into its galley and seals off at the bottom with a copper seal correct?When you say oil gets by the injector it would have to be injected through the injector correct.It would be hard for it to get from the galley to the cylinder by that copper washer seal at the bottom.But if o rings are bad oil could go where the fuel is supposed to go and visa versa.Am I out in left field here or am I correct.Explain if im not correct because I would like to know.Thanks
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Old 02-10-2007, 03:28 PM
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you gotta remember that the oil we are talking about is pressurized to 3000psi and it can blow past those orings and down into the cylinder. I had two on my truck however that leaked internally and that is was caused my oil consumpsion
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Old 02-10-2007, 04:05 PM
Is it even worth it???



 
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The high pressure oil gets past the o-ring seals in the injector, and reaches the fuel supply. I've seen it happen on a T444E powered school bus. Engine oil was ending up in the fuel tank... mileage jumped, or seemed to, but it was taking half a gallon of oil twice a day to keep the crankcase full.
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Old 02-10-2007, 04:49 PM
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Yes guys I realize the pressure and the oil getting injected but what I was saying is it doesnt look like to me it could get by the crush washer at the bottom of the injector?It would have to actually go through the injector itself somehow.Thanks for the quick replys
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Old 02-10-2007, 05:06 PM
Is it even worth it???



 
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The oil does not go past the crush washer... it baypasses the o-rings around the injector that seal the oil gallery from the fuel gallery. This lets oil get into the fuel supply. Some of that oil gets injected with the fuel and burnt in the cylinder... causing blue smoke... if the condition is not repaired quickly, lots of oil ends up in the fuel, and the blue smoke gets worse.
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Old 02-10-2007, 05:11 PM
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Thats what I was looking for.Is it more common for oil to get in the fuel or fuel to get in the oil.I guess both could possibly happen.But with the oil at that high of psi I guess it would be more than likely the oil in the fuel.Thanks for the reply
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Old 04-05-2007, 12:22 AM
KBG KBG is offline
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I have a 99 born 5/98, I rebuilt my injectors my self, now the truck is burning more oil than fuel. I then replaced the O-rings a second time with little change. How do I tell wich injector('s) are the problem(S)
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